Scientists have recently figured out why the sexual spark can go out: The chemical signals that make people sexy to new partners, that create that "love at first sight" feeling, only stay active for about two years.

We don't often turn to Homer Simpson for relationship advice, but occasionally he's right on the mark. "When it comes to compliments," he's said, "women are ravenous blood-sucking monsters, always wanting more...more...more! And if you give it to them, you'll get plenty back in return."